15.09.09

What does a plant cell have that an animal cell doesn't? (Three things)

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Cell Wall

Chloroplasts

Permanent Vacole

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15.09.09

Describe the collaboration between organelles

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15.09.09

Enzymes are proteins. The genes which codes for the production of these proteins are held on DNA in the nucleus. A messenger molecule takes these codes to the ribosome on the rough ER. This is where the proteins are made. Then they are transported to the golgi apperatus where they are sorted, processed and packaged into vesicles. These make thier way up to the cell surface membrane where they fuse to release the protein from the cell. The energy need to make all this possible comes in the form of protiens which is made in the rough mitocondria.

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29.09.09

What is the cell membrane used for and made up of?

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The cell membrane is needed to control what water goes in and out of the cell and it controls it to stop it from bursting.

Cell membranes are made up of phospholipids which hyrodphobic (water hating+ploar) and hydrophillic (not attracted to water and non polar) molecules. They can form bilaters and is the basic structure of membranes. Gycoproteins (chains of charbohydrates) and are called Glycoproteins.

Cholesterol is also present and maintains the cells fluidity and in=creases stability of the membrane. (Fluid mosaic).

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29.09.09

Describe the basic structure of the plasma membrane.

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29.09.09

Phospholipid bilayerThe basic structure of membranes.

Periperal proteinon the inner surface: Globular protein.

Perpiheral proteinon the outter suface - can be a lipid and have a group attached which are usually marker proteins.

Integral protein: the protein stretches the full width of the membrane and is sometimes called a channel protein.

Gycoprotein These are short chains which have charbohydrates attached to them.